Signaling device for polystation-circuits.



W. W. DEAN.

SIGNALING DEVICE FOR POLYSTATION CIRCUITS.

APPLICATION FILED AUG. 9, 1905.

1,125,492, Patented Jan. 19, 1915.

2 SHBETSSHEBT 1.

THE NORRIS PETERS C0 PHOTO-LITHO.. WASHINGTON, D

W. W. DEAN.

SIGNALING DEVICE FOR POLYSTATION CIRCUITS.

APPLICATION FILED AUG. 9, 1905.

1,125,492.; I Patented Jam 19, 1915.

2 SHEETS-SHEET 2.

UNITED STATES PATENT ornion.

WILLIAM W. DEAN, or :ELYR'IA, OHIO; CURTIS B. CAMP, TRUSTEE, APPOINTEDBY COURT.

SIGNALING DEVICE FOR POLYS'IATION-GIRCUITS.

Application filed August 9, 1905.

To all whom it may concern Be it known that I, VVILLIAM W. DEAN, acitizen of the United States, residing at Elyria, in the coimty ofLorain and State of Ohio, have invented certain new and usefulImprovements in Signaling Devices for Pplystation-Circuits, of which thefollowing is a specification, reference being had therein to theaccompanying drawing.

My invention relates to signaling devices for poly-station circuits, andcomprises a polarized ringer having its armature mounted in a neutralposition upon a strong spring, so strong that ordinary ringing currentmomentarily applied produces no effect. Only when current of the properfrequency has passed through the ringer coils for a long enough periodto start up the armature and the tuned clapper, do the gongs receive anystroke. I tune the clapper rods or reeds by fastening thereon clappersformed in cylindrical shape and of different lengths and weights.

view of the same. Fig. 13 is atop plan View with the gongs removed. Fig.4: is a bot- .tom plan view. Fig. 5 is a perspective view of the clapperrod and connected parts removed.

I will first describe the mechanical structure of my ringer, and thenpoint out the method of its employment.

Referring to Figs. 1 to 5, A designates a pair of magnet spools withcores a, a, secured by screws a upon the yoke B. At the lower ends ofthese cores is carried a secondary non-magnetic yoke B, the same beingsecured by the nuts 6, 6 upon the sleeves, 6 secured to the magnet headsor in any other suitable manner. The yoke B has front and reardropportions; 6 6*, each slotted as indicated at b for the re ception of theends a, c, of the armature block or bolt, C. Oneachof these is fitted alock-nut, 0 Thisblock-and.itsconnected parts are best shown in Figs. 4and 5 the block, C, is preferably squared throughout .that portion of:its length which lies between the parts b b", ,its'ends being reducedand threaded at 0,0. The squared portion is milled out onone side toreceive thestifii', short leaf-spring, (1?. To hold this in position onthe block, a short bar, 0 is clamped Specification of Letters Patent.

Patented Jan. 19, 1915.

Serial No. 273,459.

upon it by means of screws 0 Secured upon the spring above the block isthe armature C. This is made of pressed metal in two halves, c, 0", eachhaving an upstanding flange, 0 These two flanges are set upon oppositesides of the spring and secured together through the latter by means ofrivets, 0 Each flange is formed with a semi-cylindrical channel to oneside of the spring, and an outside rivet, 0 the channels when puttogether receiving the clapper rod, G which is thus secured rigidly tothe armature structure by the common binding means. At its upper end theclapper rod is fitted with the clapper, C, composed of a length oftubing solidly driven on the rod. The length of this tube variesaccording. to the tunedesired.

In assembling the device the ends of the block, C, are inserted frombeneath into the slots, If, the clapper rod at the same time passing upthrough an opening, 0 in the yoke, B, and lying in front of the upperyoke, B, between the gongs, G. The armature having been adjusted withregard to the poles, cf, of the ringer magnet, the nuts, cflare set uptightly, and thereafter the only movement of the armature possible tomake is that permitted by bending the spring, G Secured upon the upperyoke and passing down behind the magnets into contact with the rear nut,0 is the permanent magnet, M, and as the upper yoke, B, and the block,C, with its parts, are of iron, it follows that a very efficientmagnetic circuit is thus obtained, the only breaks in which are theairgaps between the poles, a and the armature, C. The gongs, G, aremounted upon posts g, the latter being carried upon metal segments, Z2each pivoted at 5 upon a suitable bolt passing through the yoke B. Atits front edge, (2 each segment is provided with gear teeth meshing withthe worm, I), cut on the stem of the bolt, 5 This bolt,

.7), has its ends supported in drop bearings formed in book shape on theyoke, B, as shown at 7), Figs. 1, Zand 3. In order to get the bestresults with this ringer, an accurate adjustment of the gongs isnecessary, and this adjustment moreover must be solid,

so that when the parts are once set they will remain undisturbed by theforcible action which I contemplate. The gong posts pass up from thesegments through lateral enlarged openings, 67, in extensions, 5, on theyoke,

By means of a suitable wrench applied to the head of either bolt, b thesame may be turned, and the worm thereon will move the segment one wayor the other and with it the gong post and gong.

It will be observed that the construction of my ringer throughout issuch as to make it very solid and substantial. Its depreciation througha long period of time is intended to be negligible, and its operationuniformly efficient throughout its life. It is so designed that it maybe substituted for an ordinary bridging ringer, or in fact for anyringer at any station, having parts of standard type. The sizes andgeneral arrangement of parts are such that no special features arerequired in the rest of the telephone set to permit the use of thisringer.

It is to be understood that in a system employing four of my tunedringers momentary current of right or wrong frequency will noteffectively move any of the four armatures. If the current continues toflow for a brief period, however, the armature at that station which istuned to respond to the selected frequency gradually gets into motion.As it is pulled over, the strength of the magnetic pole stronglyincreases, and in order to get a powerful effect, and in fact relying asI do upon what might be termed sheer brute force, I discard all delicateadjustments and safeguards, and strip the magnet pole so that thearmature may come into direct contact with. it. 'I thus get a maximumpull and a maximum effect on the clapper just when I need it the most,that is at the instant of possible interference due to reactivevibration from the gong. Thus I start my selective ringer by tuning itexactly, so that it will respond before striking the gong, and after ithas once started to vibrating I provide a strong enough action topositively overcome any interference. Those ringers, however, which havenot started into good vibration, owing to their being out of tune, areof course unaifected, and I may add that the strength of the springs, Cis such that it takes almost perfect resonance to overcome theirstiffness.

Having thus described my invention, What I claim and desire to secure byLetters Patent is:

1. In a harmonic ringer for telephone party-lines, a yoke, a pair ofelectro-magnets carried thereon, a pair of gongs and gong posts adjustably secured to and carried upon said yoke, supporting ears upon saidyoke, a threaded spindle mounted in said ears in proximity to each gongpost and adapted to move the same when turned, a second or supplementalyoke carried upon the electromagnets, a fiat spring secured tosaidsupplemental yoke and extending in a direction parallel to andintermediate of the magnet cores, a transverse armature secured to andsuspended upon said spring, the ends of the armature projecting both,Ways from the spring into proximity to the free poles of the magnets,and a clapper-rod for the gongs mounted upon the armature and carrying aclapper of substantially uniform diameter, substantially as described.

2. In a harmonic ringer for telephone party-lines, a yoke, a pair ofelectro-magnets carried thereon, a pair of gongs and gong posts adjustably secured to and carried upon said yoke, supporting ears upon saidyoke, a threaded spindle mounted in said ears in proximity to each gongpost and adapted to move the same when turned, a second or supplementalyoke carried upon the electromagnets, a flat spring secured to saidsupplemental yoke and extending in a direction parallel to andintermediate of the magnet cores, a transverse armature in two partsriveted to and supported upon said spring, the ends of the armatureprojecting both ways from the spring into proximity to the poles of themagnets, and a clapperrod for the gongs mounted upon the armature andcarrying a clapper, substantially as described.

3. A telephone ringer having a clapper rod supported on a spring, acylindrical clapper having its axis coincident with the axis of the rod,gongs supported on opposite sides of the clapper, a transverse armatureconnected to the clapper rod, a pair of electromagnets for rocking saidarmature and thereby forcing the clapper against the 'ongs alternately,a supporting yoke for the armature, a bridge block for said yoke, and ashort, stiff, leaf spring mounted upon the bridge block and centrallyconnected to the armature, substantially as described.

4. A telephone ringer having a clapper rod supported on a spring, acylindrical clapper having its axis coincident with the axis of the rod,gongs supported on opposite sides of the clapper, a transverse armatureconnected to the clapper rod, a pair of electromagnets for rocking saidarmature and thereby forcing the clapper against the gongs alternately,a supporting yoke for an armature yoke carrying a stiff leaf springcentrally connected to and supporting the armature, and a cylindricalclapper for the gongs carried intermediate thereof on the clapper rodand having the axis of its curvature lying in the axis of the rod,

the length, position or weight of the clapper determining the pitch orperiod of the ringer, and the cylindrical form thereof permitting ofvariations in its positioning upon the clapper rod without affecting thelength of stroke, substantially as described.

6. In combination with a telephone ringer, a gong adjusting mechanismconsist ing in a supporting frame, a plate pivoted to such frame, a postsecured in such plate for supporting such gong, such plate toothed onone edge a screw carried by such frame and engaging the toothed edge ofsaid plate whereby rotation of such screw changes the position of suchpost relatively to such frame.

7. In combination with a telephone ringer, a gong adjusting mechanismconsisting in a supporting frame, a plate pivoted to such frame, a postsecured in such plate for supporting such gong, a screw carried by suchframe and adapted to engage such plate whereby rotation of such screwchanges the position of such post relatively to such frame.

8. In a telephone ringer a clapper rod a spring supporting said rod, aclapper for the rod, gongs supported on opposite sides of the clapper, atransverse armature connected to the clapper rod, a pair ofelectromagnets for rocking said armature and thereby forcing the clapperagainst the gongs alternately, and a supporting yoke for the armature,said yoke connected to said supporting spring on the opposite side ofthe armature from the yoke support.

9. In a harmonic ringer, a pair of electromagnets, a pair of gongs, anarmature extending across the poles of the electromagnets and adapted tobe attracted alternately thereby, a clapper rod carried by the armaturefor striking the gongs, and a spring for supporting the armature so thatthe poles of said electromagnets are upon one side of the armatureandthe support for the spring is upon the opposite 'side thereof.

10. In a harmonic ringer, a pair of electromagnets, a pair of gongs, anarmature extending across the poles of the electromagnets and adapted tobe attracted alternately thereby, a clapper rod carried by the armaturefor striking the gongs, a yoke carried by the working ends of theelectromagnets, and a tuned spring carried by said yoke, said springsupporting the armature between the point where the yoke is carried bythe electromagnets and the point where the spring is carried by theyoke.

In testimony whereof I afiix my signature in presence of two witnesses.

WILLIAM W. DEAN. Witnesses RAY I-I- MANSON, GEO. A. SCOVILLE.

Copies of this patent may be obtained for five cents each, by addressingthe Commissioner of Patents,

Washington, D. O.

